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Cylinder blown sheet is a type of hand-blown window glass. Large cylinders
are produced by swinging the cylinder in a trench or blown into a cylindrical
iron mould. The glass is then allowed to cool before the cylinder is cut.
The glass is then re-heated and flattened. The result is much larger panes
and improved surface quality over broad sheet.

Cylinder blown sheet glass has been manufactured in France and Germany
since the 18th Century.  It began to be manufactured in the UK in the mid
19th Century, although only one small company continues manufacturing.

Machine drawn cylinder sheet was the first mechanical method for "drawing" window glass. Cylinders of glass 40 feet (12 >m ) high are drawn verticallyfrom a circular tank. The glass is then annealed and cut into 7 to 10 foot (2 to 3 m) cylinders. These are cut lengthways, reheated, and flattened.  This process was invented in the USA in 1903. This type of glass was manufactured in the early 20th century (it was manufactured in the UK by Pilkington from 1910 to 1933).

Edited from Wikipedia and other sources

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